Antimagnetic watch.



PATBNTBD s121125, 190s.

H. SL MONTGOMERY. ANTIMAGNBTIG WATCH.

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HENRY S. MONTGOMERY, OF TOPEKA, KANSAS.

ANTIMAGNETIC WATCH.

Specification of Letters Patent.

Patented Sept. 275, 1906.

Application filed May 9, 1905. Serial No 259,547.

T0 al?, whom, it may con/cern:

Be it known that I, HENRY S. MONTGOM- ERY, a citizen of the United States, residing at Topeka, in the county of Shawnee and State of Kansas, have invented a new and useful Antimagnetic Watch, of which the following is a specification.

The present invention relates more particularly to watch-movements; and the object is to pro vide novel means of a suitable nature for protecting the delicate and easily-influenced parts of such movement from becoming deleteriously magnetized or affected when placed in fields of magnetic force.

A further object is to provide means of the above character that is applicable to any of the well-known types of watches, and. necessitates no material change in the structure or arrangement thereof.

In the drawings, Figure 1 is a view in elevation of an ordinary type of barrel with the improvements applied thereto. Fig. 2 is a plan view of the same. Fig. 3 is a cross-sectional view therethrough. Fig. 4 is a plan view of one of the disks` Fig. 5 is a similar view of the other disk. Fig. 6 is a view in elevation of a later type of barrel with the improvements applied thereto. Fig. 7 is a sectional view therethrough. Fig. S is a view in elevation of another form of barrel. Fig. 9 is a sectional view therethrough.

Similar reference-numerals designate corresponding parts in all the figures of the drawings.

In the embodiment illustrated in the first five figures, an ordinary type of mainspringbarrel 10 is shown, with which are associated the main driving-wheel 11 and the mainspring-barrel arbor 12, said arbor projecting beyond opposite sides of the barrel. Secured in any suitable manner to the opposite sides of the barrel, and therefore on opposite sides of the main wheel 11, are comparatively thin highly-magnetized disks 13 and 14, which are connected by means of the barrel-arbor, so that they constitute, in effect, a single magnet the negative pole of which is preferably the upper disk 13, the positive pole being the lower disk 14. In the structure illustrated these disks are secured in place by means of screws 15, countersunk in the same and fastened in the barrel; but any other means found suitable may be employed.

While I am unable to fully explain the theory of the invention, in actual practice I select a thoroughly-magnetized disk and del termine, by meansof a compass, the positive side thereof. I secure this disk with the positive side against one side of the barrel. I then determine, in like manner, the negative side of another disk and place this disk against the opposite side of the barrel. Said disks are connected by the arbor, which thus appears to form therewith a single magnet, the poles of which are on opposite sides of the barrel. As a result a field of magnetism is produced about the barrel, and careful .test and experience have demonstrated that it controls an attack of magnetism when the watch is subjected to such influence by being introduced into the magnetic field.

A slight modification of the invention is illustrated in Figs. 6 and 7, wherein a structure is shown ordinarily employed in the new type of Elgin movement. In this construction the mainspring-barrel 1()3L is associated with the mainspring-barrel arbor 11rl and is itself magnetized. The main wheel 12, also associated with the barrel and arbor, has located on the opposite side thereof to the barrel a disk 13a., which disk is also highly magnetized and is connected, by means of the arbor 1 1, with the magnetized barrel. The action of this structure is the same as that already described.

In Figs. 8 and 9 another embodiment of the invention is shown, this type being employ ed in certain of theWaltham movements. -The magnetized mainspring-barrel 10ID is associated with the mainspring-barrel arbor 11b, and located at one side of said barrel is the main wheel 12b. The magnetized disk 13b is arranged on the opposite side of the 'wheel to the barrel.

Thus simple means is provided within the watch-movement for protecting the easilyaffected parts from being magnetized when brought into the fields of magnetic influence of electric mechanisms of different character, and it will be apparent to those skilled 1n the art that the structure is applicable to the ordinary types of movement without material expense or change in the structure and arrangement of parts.

From the foregoing it is thought that the construction, operation, and many advantages of the herein-described invention will be apparent to those skilled in the art without further description, and it n ill be apparent that various changes in the size, shape, proportion, and minor detalls of construction may be resorted to without departing from y IOO AlZIO cated on the arbor onone side of the Wheel, and a permanently-magnetized disk located on the arbor on the o posite side of the Wheel, said arbor constituting a magnetic connection between the disk and barrel, and said disk, barrel and arbor constituting a permanent magnet.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two Witnesses.

HENRY s. MONTGOMERY.

Witnesses:

J. L. CAMPBELL, THos. E. PROUT. 

